[NTG-context] Is there anything like developer's manual for ConTeXt?

Hi everyone, After fighting with ConTeXt one month, I find it's too difficult. I have two years experience of LaTeX. I never thought ConTeXt could be so difficult. Using ConTeXt is like climbing a steep mountain, every step need extensive searching, reading, and asking. Sorry for the useless complain. I'm stuck by so many problems. I might be lack of the basic knowledge of ConTeXt. Could someone tell me where I can find manuals or papers that describe the logic of ConTeXt design and basics of ConTeXt programming. Thanks in advance. Best wishes, Wei-Wei